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June 3, 1930. A A. J. ADAMS v Re, 17,686

swIvELING' camz original Filed July 2'?, 1925 Reissued June 3, 1930 UNITED` STATES PATENT OFFICE ARTHUR J'. ADAMS, 0F RENTON, WASHINGTON, ASSIGNOR TO WILLIAM S. FERRIS, OF

ELKHART, INDIANA, TRADING AS DOMOR-E CHAIR COMPANY SWIVELING CHAIR Original No. 1,691,035, dated November 13, 1928, Serial No. 46,229, filed July 27, 1925. Application for reissue filed April 23, 1930, Serial No. 446,764.

This invention relates to improvements in swiveling chairs and consists of the matters hereinafter described and more particularly pointed out in the appended claims.

6 One of the objects of the invention is to provide a novel connection between the seat post and standard permitting a rotative movement of the post with respect to the standard and at the same time a relative vertical movement between the two.

A further object is to provide a construction including a tube in which the seatpost is disposed for rotative but not endwise movement and to provide a means on lthe standard for securing said tube thereto, which means readily permits of a vertical adjustment between the tube and standard.

These objects of the invention as well as others, together with the advantages thereof, will more fully appear as I proceed with my specification. .l

In the drawings:

Fig. 1 is a view in front. elevation of a chair embodying my improved invention.

Fig. 2 is a horizontal sectional viewon` an enlarged scale as-taken'onr the line 2-2 of Fig. 3 is a vertical sectional view as.v taken on the line 3-3 of Fig-.12.

Fig. 4 is a perspective lview of a binding or clamping ring embodiedv in my improved construction.

Referring now in detail to that embodiment of the invention illustrated in the accompanying drawings, 1 indicates as a whole the seat frame and seat of a swivelin'g "chair,L and 2 indicates the' post upon the top end of which the seat frame is secured in any suitable manner. As-the construction-'of thev seat frame itself and the manner of attaching it to; the post 2 forms no particular partof the present invention, it need not be 'described in further detail at this time.

The post 2, which is of substantial length is in the form of a metallic tube having a smooth exterior surface and is ournalled in a second tube 3. The seat post is capable of a free rotating movement in the tube 3 and is held therein against endwise movement in any suitable manner. As shown herein, a

`said` tube.

bolt 4 is threaded through the bottom end of the seat post and is engaged with the bottom end of the tube l3 to prevent such an endwise movement. j l

' 5 indicates as a whole the standard or base of the chair A,and with which the tube 3, together with the post 2, is vertically adjustable in a manner which will appear later. Said standard is made upof a plurality of tubular metallic legs, each of which has a vertical'top portion or end 6 anda vertical bottom portion or end 7 which is offset with respect tothe top portion and is connected thereto by intermediate horizontal and reverse curved portions 8. A caster 9 is provided on the bottom end of each leg.

The vertical top ends of said legs are grouped together about vertically spaced top and bottom spiders or plates 10 and 11, respectively, each of which includes arcuately spaced ears 12 with which said leg parts are engaged and are secured as by the bolts 13. Said spiders have centrally arranged aligned openings for the easy passage therethrough of the tube 3 which also has a smooth eX- terior., rWhen the legs are secured to the spidersas before mentioned, the bottom ends of said-legs are disposed radially with revspect. to the post 2 and tube 3 so that the standard presents a stable support or base for the chairas a whole. The horizontal portions of all of said legs are connected together by a suitable bracing spider 14.

Surrounding the tube 3 just above the bottom spiderj 11 isa binding ring or annulus e 15 (see Fig. 4) which has a central bore slightly larger ,than the outside diameter of The spider 11 has a short upsta'ndin'g stud 16 on its top side in a position arranged between two adjacent ears 12-12. As shown said stud is formed by the head of a bolt secured in said spider by an associated nut. The underside of a portion of said ring engages on said stud and is capable of a limited rocking movement about the same as a f ulcrum. Sp aced at equal arcuate distances 'from said stud are bolts 17-17, each passing up through suitable holes in the bottom vspider and; threaded into said binding ring. A helicalexpansion spring 18 surrounds each fas bolt and abn-ts at its ends between the head 19 of the bolt and the underside of the spider 11. The springs normally act through the bolts to draw the associated side of the ring (which is diametrically opposite what may be termed the .fulcrum side thereof) `downwardly toward the plate and out of a plane at a rightr angle to the tube and post so that saidring binds on said post and is thus locked thereto.

Means are provided to act in opposition to said springs when manipulated to move the ring intov a position standing at a right angle to said post and tube and thus release the clamping action of said ring so that the post and tube may befcapable of a vertical adjustment upwardly or downwardly and such means is as follows:

On the bottom side of said bottom spider at a point 'substantially opposite the stud 16 is provided a lug 20. Upon the innerfside ofk said lug is provided a cam member 21 and on the outerside of'saidlug is pivoted a lever 22, the common pivotal axis of said cam member and lever being provided by a screw 23. The

shorter end of said lever is offset outwardly.

to pass the adjacent leg membersof the standard and at the same time to provide the handle for actuating the cam. In said bottom spider is formed a slot 24, in the plane of the cam member sdl that when said lever is actuated the cam will pass through said slo't and engage the ringto move the same against the action of the springs as before described;v By the usev of the bolts 17-17 the tension of the springs 18 may be adjusted to the bestbinding action of the ring upon the tube 3.

Assume that the ringis in a position exert:- ing a binding action on the tube and it is desired to adjust the height of theseatframeto the comfort of the occup ant.` Under such conditions the lever 22 stands substantially vertical between two adjacent legs of the standard. Upon actuation, the cam member21 will pass through the slot 24 in thespider and will engage the ring and move it against the/action of the springs 18 into a position wherein 1t stands at ya right angle to the tube.` Thisre# leases the binding action of the rin on the tube so that itis freelto be moved vertically in either direction tovprovide the desiredheight of seat. ",Whenthi's has been vdone vthe lever is swung'back toits normal-'position which is substantiallyl vertical, and the cam 1s withdrawn` from'l its engagement with the ring which under i thek action of its associated springs is immediately drawninto binding engagement on the tube and connects `the tube tothe standard. i y j It is apparent that my improved construction has many advantages.` The bindin action of the ring on the tube ma be adj uste to the best operating conditions y threading the bolts 17 either further into or outof the ring; The parts are simple andfew in number and therefore may be readily assembled and adjusted.

While in describing my invention, I have referred to certain details of construction and arrangement of parts, this is to be ytaken as by way of illustration only and not by way of limitation, hence, I do not wish to be limited thereto except as may be pointed out in the appended claims. j' 1 I claim as my invention y 1. A chair embodying therein a standard comprising a plurality of legs, top and bottom spiders to which said legs are secured, a seat post, a tube in which said seat post is rotatively mounted and whichtube passes through said spiders, a'binding ring on said bottom spider, means carried by said spider for normally urging it into binding action upon said tube, andmeans also carried by said spider and adapted to beactuated to engage said ring to release its binding action on the tube.

2. lA chair embodying therein a standard comprising a plurality of legs, top and bottom spiders to which said legs aresecured, a seat post, a tube in which said seat post is rotatively mounted and which tube passes through said spiders, a rin gk surrounding said tube near said bottom spider, coacting means on said spider and ring :providing a fulcrum for said rino' coactinu meansfo erativel connectino'` b? b b said ring and spiderat a point spaced from the fulcrum forrocking said ring in one direction about said fulcrum into binding engagement with saidtube, and means adapted to engage said ringand rockfit in the other direction to release the binding action thereof from the tube` 3. A chair embodying `therein' a standard comprising a plurality of legs, top and bottom spidersto which said legs are secured, a seat post', a tube inl which said seat post is rotatively mounted and which tube passes through said spiders, a ring surrounding said tube near said bottom spider, coacting means on said spider and ring providing a fulcrum forsaid'ring, bolts passingthrough said bottom spider and threaded into said ring, springs on saidboltsnormally acting to rock the ring aboutl said fulcrum in one direction into bindinA action on said tube, and means capable of eing actuated in opposition to said springs for rockingsaid ringabout the fulcrum in: `the loppositei direction to release the rbinding actionthereof from the tube.

In testimony whereof, I have hereunto set my `hand this day of March, 1930i. f

ARTHUR J. ADAMS. 

